February 26, 2015: Felipe Massa showed the first tangible proof of Williams' potential this year by topping the times on the opening day of the final pre-season test in Barcelona as McLaren experienced more problems and Mercedes also suffered a rare reliability issue

February 3, 2015: The third day of pre-season testing in Jerez saw Sauber's Felipe Nasr at the top of the timesheets, while McLaren made limited progress with its new Honda-powered MP4-30 and Red Bull were delayed by a lengthily Renault engine change